Waterproof closed stepping motor

Abstract

The utility model relates to the technical field of stepping motors, in particular to a waterproof closed stepping motor, which comprises a shell, a motor assembly and a shell cover, the motor assembly is arranged in a cavity formed by connecting the shell and the shell cover, and the motor assembly is provided with an output shaft extending out of the shell cover. A circumferential groove is formed in the circumferential outer circumferential face of the contact section of the output shaft and the shell cover, a sealing ring is arranged in the circumferential groove in a sleeved mode, the sealing ring is of a double-lip structure and comprises an inner lip and an outer lip, the inner wall of the inner lip is in interference fit with the circumferential groove of the output shaft, and the outer wall of the outer lip is in interference fit with a shaft hole of the shell cover. The tight end face of the shell cover tightly presses the side surface of the sealing ring in the axial direction, so that radial and axial sealing is achieved. Through multiple sealing measures of arranging the sealing ring with the double-lip structure between the output shaft and the shell cover, tightly welding the welding rib and the accommodating groove, arranging the silicon rubber sealing layer at the wire passing hole and the like, water is prevented from entering the motor in all directions, the waterproof grade of the motor is greatly improved, and the service life of the motor is greatly prolonged.

Description

Technical Field

[0001] This utility model relates to the field of stepper motor technology, and in particular to a waterproof enclosed stepper motor. Background Technology

[0002] The housing sealing structure of mainstream stepper motors currently on the market has significant defects, and these design flaws can lead to serious reliability problems under complex operating conditions. Traditional riveting assembly methods, where the mechanical connection between the housing and cover plate is limited by machining precision, inevitably create microscopic gaps. To maintain magnetic circuit continuity, the housing's pole claw area often employs a discontinuous stamping process. The transition zone at the base of the pole claw can develop V-shaped gaps due to material springback, becoming a high-risk area for liquid penetration; especially under vibration conditions, the effective penetration cross-sectional area of ​​these gaps will increase. Furthermore, when the motor operates in a temperature range of -20℃ to 85℃, the difference in thermal expansion coefficients between the aluminum alloy housing and the stainless steel rivets can cause periodic opening and closing movements at the mating surfaces. Utility Model Content

[0003] The technical problem to be solved by this utility model is: in order to solve the problem in the above-mentioned background technology that dust or moisture can enter the interior of the motor through gaps, affecting the service life of the motor and even causing the motor to fail, a waterproof enclosed stepper motor is provided. The motor assembly is completely enclosed by a housing and a cover. The motor assembly is fastened to the housing with self-tapping screws, and the housing and cover are ultrasonically welded. At the same time, a groove is made at the output shaft of the motor assembly, and a sealing ring is assembled at the groove and cooperates with the hole of the cover to achieve a sealing effect.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a waterproof enclosed stepper motor, including a housing, a motor assembly, and a cover. The motor assembly is disposed in a cavity formed by the housing and the cover. The motor assembly has an output shaft extending out of the cover. A circumferential groove is formed on the outer circumferential surface of the section where the output shaft contacts the cover. A sealing ring is fitted inside the circumferential groove. The sealing ring has a double-lip structure, including an inner lip and an outer lip. The inner wall of the inner lip is interference-fitted with the circumferential groove of the output shaft. The outer wall of the outer lip is interference-fitted with the shaft hole of the cover. The end face of the cover presses against the side surface of the sealing ring axially to achieve radial and axial sealing.

[0005] By setting a double-lip sealing ring on the circumferential outer surface of the contact section between the output shaft and the housing cover, radial and axial sealing is achieved, effectively preventing dust or moisture from entering the motor from the contact area between the output shaft and the housing cover, ensuring the motor's waterproof performance in humid environments, and extending the motor's service life.

[0006] According to one embodiment of the present invention, the housing has connecting portions protruding outward on both sides along the radial direction, and the motor assembly extends to both sides of one end facing the housing cover to form mounting ears, which are connected to the connecting portions by fasteners.

[0007] The connecting parts on both sides of the housing are connected to the mounting ears of the motor assembly by fasteners, which enhances the connection stability between the motor assembly and the housing, ensures that the components will not loosen during motor operation, and improves the overall structural strength of the motor.

[0008] According to one embodiment of the present invention, the cover is recessed inward at the position of the corresponding fastener to form a relief groove.

[0009] The cover is recessed inward at the position of the corresponding fastener to form a relief groove, providing installation space for the fastener, avoiding interference between the fastener and the cover, facilitating the installation and removal of the fastener, and ensuring the integrity of the cover.

[0010] According to one embodiment of the present invention, the fastener is a self-tapping screw.

[0011] Self-tapping screws have excellent self-tapping properties, enabling them to quickly and securely connect mounting ears to connecting parts, thus improving assembly efficiency and connection reliability.

[0012] According to one embodiment of the present invention, the opening edge of the shell is provided with a ring of welding ribs, and the shell cover is provided with a receiving groove for the welding ribs at the corresponding position of the welding ribs. The welding ribs extend into the receiving grooves and fuse at the contact surface to form a gapless annular connection structure.

[0013] The housing and cover are tightly connected by ultrasonic welding to form a gapless sealed structure, which further enhances the waterproof performance of the motor and prevents moisture from seeping in from the connection between the housing and cover.

[0014] According to one embodiment of the present invention, the height of the weld bead in its free state is 0.1 to 0.3 mm greater than the depth of the receiving groove.

[0015] During ultrasonic welding, the weld bead can fully fill the receiving groove and form a certain amount of compression, ensuring a tighter connection after welding and further improving waterproof sealing.

[0016] According to one embodiment of the present invention, the cross-section of the welded rib is trapezoidal.

[0017] The trapezoidal cross-section of the weld bead allows for better contact with the receiving groove during welding, increasing the contact area and improving welding strength and sealing performance.

[0018] According to one embodiment of the present invention, a connecting wire is also included. One end of the connecting wire is electrically connected to the wiring terminal of the motor assembly, and the other end extends through a wire hole on the side wall of the housing. A silicone rubber sealing layer is filled between the inner wall of the wire hole and the connecting wire. The silicone rubber sealing layer simultaneously covers the edge of the wire hole and the outer surface of the connecting wire to form an integrated sealing structure.

[0019] This design effectively prevents moisture from entering the motor through the wire hole. At the same time, the silicone rubber sealing layer has a certain degree of flexibility, which can adapt to the slight movement of the connecting wire and ensure the reliability of the seal.

[0020] According to one embodiment of the present invention, a first fixing part and a second fixing part protrude radially outward on the side wall of the housing. The first fixing part is located on one side of the upper part of the housing, and the second fixing part is located on the other side of the lower part of the housing. Both the second fixing part and the first fixing part are provided with through bolt mounting holes.

[0021] This design provides two fixed points for the entire motor, facilitating its installation and securing within the equipment, ensuring that the motor will not shift during operation, and improving the overall installation stability of the motor.

[0022] According to one embodiment of the present invention, a positioning hook is also provided on the side wall of the housing near the second fixing part.

[0023] During installation, the positioning hooks can cooperate with the mounting structure of external equipment to play a preliminary positioning role, which facilitates subsequent bolt fixing and improves installation efficiency and accuracy.

[0024] The beneficial effects of this utility model are:

[0025] (1) By setting a double-lip structure sealing ring between the output shaft and the housing cover, tightly welding the welding rib and the receiving groove, and the silicone rubber sealing layer at the wire hole, a variety of sealing measures are taken to prevent moisture from entering the motor in all aspects, so that the motor can operate stably in humid or even underwater environments, which greatly improves the waterproof level and service life of the motor.

[0026] (2) The housing and motor assembly are connected by fasteners with connecting parts and mounting ears, and the design of fixing parts and positioning hooks on the side wall of the housing ensures a firm connection between the various parts of the motor and overall installation stability, so that it can work normally even in vibration or impact environments.

[0027] (3) The use of self-tapping screws, the design of the clearance groove on the cover and the auxiliary positioning function of the positioning hook make the motor assembly process more convenient and faster, reduce production costs and improve production efficiency.

[0028] (4) The overall design enables the motor to better adapt to different installation environments and usage requirements. Whether it is fixed installation or used in conjunction with other equipment, it can maintain good performance and reliability, and has strong versatility and practicality. Attached Figure Description

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] Figure 1 This is an assembly drawing of Embodiment 1 of this utility model.

[0031] Figure 2 This is a cross-sectional view of Embodiment 1 of this utility model.

[0032] Figure 3 This is a schematic diagram of the structure of Embodiment 1 of this utility model with the shell cover removed.

[0033] Figure 4 This is a schematic diagram of the shell structure in Embodiment 1 of this utility model.

[0034] Figure 5 This is a schematic diagram of the shell cover in Embodiment 1 of this utility model.

[0035] Figure 6 This is a schematic diagram of the assembly of the shell and the cover in Embodiment 1 of this utility model.

[0036] Figure 7 This is a schematic diagram of the sealing ring in Embodiment 1 of this utility model.

[0037] Figure 8 yes Figure 7 A sectional view.

[0038] Figure 9 This is an assembly diagram of the connecting wire in Embodiment 1 of this utility model.

[0039] In the figure: 1. Housing; 11. Connecting part; 12. Welding rib; 13. First fixing part; 14. Second fixing part; 15. Positioning hook; 2. Motor assembly; 21. Output shaft; 211. Circumferential groove; 22. Mounting ear; 3. Sealing ring; 31. Inner lip; 32. Outer lip; 4. Fastener; 5. Housing cover; 51. Clearance groove; 52. Receiving groove; 6. Connecting wire; 7. Silicone rubber sealing layer. Detailed Implementation

[0040] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0041] Example 1

[0042] like Figure 1 and Figure 2 As shown, a waterproof enclosed stepper motor includes a housing 1, a motor assembly 2, a sealing ring 3, a fastener 4, a cover 5, and a connecting wire 6. The housing 1 is used to house the motor assembly 2, which provides power and torque. The fastener 4 is used to fasten the motor assembly 2 and the housing 1. The cover 5 is connected to the housing 1 to seal the motor assembly 2. The connecting wire 6 is used to power the motor assembly 2.

[0043] Specifically, the motor assembly 2 is disposed within the cavity formed by the housing 1 and the cover 5. The motor assembly 2 has an output shaft 21 extending out of the cover 5. A circumferential groove 211 is formed on the outer circumferential surface of the section where the output shaft 21 contacts the cover 5. A sealing ring 3 is fitted inside the circumferential groove 211. Figure 7 and Figure 8 As shown, the sealing ring 3 has a double-lip structure, including an inner lip 31 and an outer lip 32. The inner wall of the inner lip 31 is press-fitted with the circumferential groove 211 of the output shaft 21, and the outer wall of the outer lip 32 is press-fitted with the shaft hole of the cover 5. The end face of the cover 5 presses against the side surface of the sealing ring 3 axially to achieve radial and axial sealing. The inner wall of the inner lip 31 of the sealing ring 3 is press-fitted with the circumferential groove 211 of the output shaft 21, generating radial contact pressure to ensure dynamic rotational sealing; the outer wall of the outer lip 32 is press-fitted with the shaft hole of the cover 5 to form a static sealing interface. The axial pressing force causes the sealing ring 3 to deform axially to compensate for manufacturing tolerances and achieve the purpose of sealing.

[0044] like Figure 3 and Figure 4 As shown, the housing 1 has connecting portions 11 protruding outwards on both radially sides. The motor assembly 2 extends to both sides of one end facing the housing cover 5 to form mounting ears 22. The mounting ears 22 are connected to the connecting portions 11 by fasteners 4. Preferably, the fasteners 4 are self-tapping screws. Figure 5 As shown, the cover 5 is recessed inward at the position corresponding to the fastener 4 to form a relief groove 51. That is, the housing 1 and the cover 5 completely enclose the motor assembly 2, and the motor assembly 2 is fastened to the housing 1 by self-tapping screws to prevent the motor assembly 2 from shaking.

[0045] like Figure 4As shown, a first fixing part 13 and a second fixing part 14 protrude radially outward on the side wall of the housing 1. The first fixing part 13 is located on the upper side of the housing 1, and the second fixing part 14 is located on the lower side of the housing 1. Both the second fixing part 14 and the first fixing part 13 have through bolt mounting holes. The first fixing part 13 and the second fixing part 14 provide two fixing points for the entire motor, facilitating the installation and fixation of the entire motor in the equipment, ensuring that the entire motor will not shift during operation, and improving the installation stability of the entire motor. A positioning hook part 15 is also provided on the side wall of the housing 1 near the second fixing part 14. During installation, the positioning hook part 15 can cooperate with the mounting structure of the external equipment to play a preliminary positioning role, facilitating subsequent bolt fixing and improving installation efficiency and accuracy.

[0046] like Figures 4-6 As shown, the opening edge of the housing 1 is provided with a ring of welding ribs 12, and the cover 5 has a receiving groove 52 for the welding ribs 12 at the corresponding position. The welding ribs 12 extend into the receiving grooves 52 and fuse at the contact surface to form a gapless annular connection structure. Preferably, the height of the welding ribs 12 in the free state is 0.1 to 0.3 mm greater than the depth of the receiving grooves 52; and the cross-section of the welding ribs 12 is trapezoidal. That is, the housing 1 and the cover 5 are melted into the receiving grooves 52 by ultrasonic waves, so that the housing 1 and the cover 5 are bonded together, ensuring that there are no gaps between the housing 1 and the cover 5, and achieving a better sealing effect.

[0047] like Figure 9 As shown, one end of the connecting wire 6 is electrically connected to the terminal block of the motor assembly 2, and the other end extends through a wire hole on the side wall of the housing 1. A silicone rubber sealing layer 7 is filled between the inner wall of the wire hole and the connecting wire 6. The silicone rubber sealing layer 7 also covers the edge of the wire hole and the outer surface of the connecting wire 6 to form an integrated sealing structure. That is, the wire exit point of the connecting wire 6 is coated with silicone rubber, which significantly improves the waterproofness and sealing performance of the entire machine. Figure 9 In this configuration, the two connecting wires 6 extend one end of the wire hole and are connected to the same connector. This configuration can be used in equipment that requires the synchronous movement of two axes, and can also be used to ensure the consistency of movement and avoid problems such as uneven load or asynchrony caused by single motor drive. For example, it can be used on air conditioner deflectors, with one such stepper motor on each of the left and right sides of the deflector.

[0048] Example 2

[0049] The difference from Embodiment 1 is that a double sealing ring structure is provided in the circumferential groove 211 of the output shaft 21, including a sealing ring 3 and an auxiliary sealing ring, which are arranged at intervals to form a two-stage sealing barrier. The sealing ring 3 is made of fluororubber, and the auxiliary sealing ring is made of silicone rubber, which can adapt to different working conditions.

[0050] Example 3

[0051] The difference from Example 1 is that the welding rib 12 is replaced with nano-silver conductive adhesive, which forms an electromagnetic shielding layer after ultrasonic welding.

[0052] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A waterproof closed type stepping motor comprising a housing (1), a motor assembly (2) and a cover (5), the motor assembly (2) being disposed in a chamber formed by the housing (1) and the cover (5), characterized in that: The motor assembly (2) has an output shaft (21) extending out of the housing cover (5). A circumferential groove (211) is provided on the circumferential outer circumferential surface of the contact section between the output shaft (21) and the housing cover (5). A sealing ring (3) is fitted inside the circumferential groove (211). The sealing ring (3) has a double lip structure, including an inner lip (31) and an outer lip (32). The inner wall of the inner lip (31) is press-fitted with the circumferential groove (211) of the output shaft (21). The outer wall of the outer lip (32) is press-fitted with the shaft hole of the housing cover (5). The end face of the housing cover (5) presses the side surface of the sealing ring (3) axially to achieve radial and axial sealing.

2. The waterproof enclosed stepper motor of claim 1, wherein: The housing (1) has a connecting portion (11) protruding outward on both sides in the radial direction. The motor assembly (2) extends on both sides toward one end of the housing cover (5) to form mounting ears (22). The mounting ears (22) are connected to the connecting portion (11) by fasteners (4).

3. The water-resistant enclosed stepper motor of claim 2, wherein: The cover (5) is recessed inward at the position of the corresponding fastener (4) to form a relief groove (51).

4. The waterproof enclosed stepper motor of claim 2, wherein: The fastener (4) is a self-tapping screw.

5. The water-resistant enclosed stepper motor of claim 1, wherein: The opening edge of the shell (1) is provided with a ring of welding ribs (12), and the shell cover (5) is provided with a receiving groove (52) for the welding ribs (12) at the position corresponding to the welding ribs (12). The welding ribs (12) extend into the receiving groove (52) and fuse at the contact surface to form a gapless annular connection structure.

6. The water-resistant enclosed stepper motor of claim 5, wherein: The height of the welded rib (12) in its free state is 0.1 to 0.3 mm greater than the depth of the receiving groove (52).

7. The water-resistant enclosed stepper motor of claim 5, wherein: The cross-section of the welded rib (12) is trapezoidal.

8. The waterproof enclosed stepper motor of claim 1, wherein: It also includes a connecting wire (6), one end of which is electrically connected to the terminal of the motor assembly (2), and the other end extends through the wire hole on the side wall of the housing (1). The inner wall of the wire hole and the connecting wire (6) are filled with a silicone rubber sealing layer (7). The silicone rubber sealing layer (7) covers both the edge of the wire hole and the outer surface of the connecting wire (6) to form an integrated sealing structure.

9. The water-resistant enclosed stepper motor of claim 1, wherein: The housing (1) has a first fixing part (13) and a second fixing part (14) that protrude radially outward on the side wall. The first fixing part (13) is located on the upper side of the housing (1), and the second fixing part (14) is located on the lower side of the housing (1). Both the second fixing part (14) and the first fixing part (13) have through bolt mounting holes.

10. The water-resistant enclosed stepper motor of claim 9, wherein: A positioning hook (15) is also provided on the side wall of the housing near the second fixing part (14).

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